Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Sales and merchandising revenues	$ 911,402	$ 993,662	$ 1,547,141	$ 1,845,678
Income (loss) before income taxes	29,155	(19,065)	26,863	(24,635)
Total assets	2,117,788	1,911,425	2,117,788	1,911,425	$ 2,162,354
Operating Segments \| Grain
Segment Reporting Information [Line Items]
Sales and merchandising revenues	365,920	488,447	642,772	966,975
Income (loss) before income taxes	9,877	6,929	9,847	1,856
Total assets	820,016	783,316	820,016	783,316	948,871
Operating Segments \| Ethanol
Segment Reporting Information [Line Items]
Sales and merchandising revenues	200,938	187,831	373,776	341,984
Income (loss) before income taxes	6,125	4,660	7,964	6,376
Total assets	248,560	170,730	248,560	170,730	180,173
Operating Segments \| Plant Nutrient
Segment Reporting Information [Line Items]
Sales and merchandising revenues	303,106	264,736	438,723	411,323
Income (loss) before income taxes	15,124	(25,825)	16,215	(19,154)
Total assets	356,166	351,871	356,166	351,871	379,309
Operating Segments \| Rail
Segment Reporting Information [Line Items]
Sales and merchandising revenues	41,438	38,149	91,870	78,539
Income (loss) before income taxes	944	5,860	4,913	11,938
Total assets	535,087	448,417	535,087	448,417	490,448
Segment Reconciling Items
Segment Reporting Information [Line Items]
Sales and merchandising revenues	800	486	1,664	1,014
Segment Reconciling Items \| Grain
Segment Reporting Information [Line Items]
Sales and merchandising revenues	462	141	993	207
Segment Reconciling Items \| Plant Nutrient
Segment Reporting Information [Line Items]
Sales and merchandising revenues	0	70	0	241
Segment Reconciling Items \| Rail
Segment Reporting Information [Line Items]
Sales and merchandising revenues	338	275	671	566
Other
Segment Reporting Information [Line Items]
Sales and merchandising revenues	0	14,499	0	46,857
Income (loss) before income taxes	(2,799)	(10,625)	(11,678)	(25,641)
Total assets	157,959	157,091	157,959	157,091	$ 163,553
Noncontrolling interests
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (116)	$ (64)	$ (398)	$ (10)

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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